Without further ado, the following was found: Issue: kernel Linux → Linux "Where a system call is marked \"2.2\" this means the system call probably " "appeared in a Linux 2.1.x kernel version, and first appeared in a stable " "kernel with Linux 2.2.0. (Development of the Linux 2.2 kernel was initiated " "from a branch of kernel Linux 2.0.21 via the Linux 2.1.x unstable kernel " "series.)"